Institute of Information Theory and Automation

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Bibliography

Conference Paper (international conference)

Blind restoration of retinal images degraded by space-variant blur with adaptive blur estimation

Marrugo A., Millán M. S., Šorel Michal, Šroubek Filip

: Proceedings ot the 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications

: 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications, (Porto, PT, 22.07.2013-26.07.2013)

: GA13-29225S, GA ČR

: medical image, retinal image, deconvolution, deblurring, space-variant restoration

: 10.1117/12.2025134

: http://library.utia.cas.cz/separaty/2014/ZOI/sorel-0422848.pdf

(eng): Retinal images are often degraded with a blur that varies across the eld view. Because traditional deblurring algorithms assume the blur to be space-invariant they typically fail in the presence of space-variant blur. In this work we consider the blur to be both unknown and space-variant. To carry out the restoration, we assume that in small regions the space-variant blur can be approximated by a space-invariant point-spread function (PSF). However, instead of deblurring the image on a per-patch basis, we extend individual PSFs by linear interpolation and perform a global restoration. Because the blind estimation of local PSFs may fail we propose a strategy for the identication of valid local PSFs and perform interpolation to obtain the space-variant PSF. The method was tested on articial and real degraded retinal images. Results show signicant improvement in the visibility of subtle details like small blood vessels.

: JD

2019-01-07 08:39